New results for photoionization and recombination of astrophysically abundant atoms and ions - the carbon sequence

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/171828· OSTI ID:6819358

Nahar, S N; Pradhan, A K ^[1]

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1. Ohio State Univ., Columbus (United States)

Photoionization cross sections and electron-ion recombination rate coefficients are presented for carbonlike ions obtained using methods developed for the Opacity Project. Extensive autoionization resonance structures and partial photoionization into specific states of the residual ion. It is shown that the excited state photoionization cross sections are not, in general, described by hydrogenic behavior and often contain strong resonances due to photoexcitation corresponding to dipole transitions in the core ion. A new method is described for calculating total recombination rate coefficients that accounts for both the radiative and the dielectronic recombination processes in an ab initio manner. Recombination rate coefficients are presented for C I, N II, O III, F IV, and Ne V at a wide range of temperatures for astrophysical applications. 14 refs.

• OSTI ID: 6819358
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 397:2; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

662100* -- General Theory of Particles & Fields-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABUNDANCE
ATMOSPHERES
AUTOIONIZATION
CARBON
COSMIC RADIO SOURCES
CROSS SECTIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
IONIZATION
NONMETALS
PHOTOIONIZATION
QUASARS
RECOMBINATION
STELLAR ATMOSPHERES